public?class?MainActivity?extends?AppCompatActivity?{
private?Button?button;
????private?EditText?editText1;
????private?EditText?editText2;
????private?CheckBox?checkBox;
????private?Button?bu;
????SharedPreferences?pref;
????SharedPreferences.Editor?editor;
????@Override
????protected?void?onCreate(Bundle?savedInstanceState)?{
????????super.onCreate(savedInstanceState);
????????setContentView(R.layout.activity_main);
????????button=?(Button)?findViewById(R.id.button);
????????editText1=?(EditText)?findViewById(R.id.editText);
????????editText2=?(EditText)?findViewById(R.id.editText2);
????????checkBox=?(CheckBox)?findViewById(R.id.checkBox);
????????bu=?(Button)?findViewById(R.id.button);
????????pref=getSharedPreferences("mypref",MODE_PRIVATE);
????????editor=pref.edit();
????????String?con=pref.getString("username","");
????????if?(con==null){
????????????checkBox.setChecked(false);
????????}
????????else?{checkBox.setChecked(true);}
????????bu.setOnClickListener(new?View.OnClickListener()?{
????????????@Override
????????????public?void?onClick(View?view)?{
????????????????String?user1=editText2.getText().toString().trim();
????????????????String?user=editText1.getText().toString().trim();
????????????????if?("admin".equals(user)&&"1234567".equals(user1)){
????????????????????if?(checkBox.isChecked()){
????????????????????????editor.putString("username",user1);
????????????????????????editor.putString("password",user);
????????????????????????editor.commit();
????????????????????}
????????????????????//Toast.makeText(MainActivity.this,"登陸成功",Toast.LENGTH_LONG);
????????????????????else?{
????????????????????????editor.remove("username");
????????????????????????editor.remove("password");
????????????????????????editor.commit();
????????????????????}
????????????????????Toast.makeText(MainActivity.this,"登陸成功",Toast.LENGTH_LONG).show();
????????????????}
????????????????else?{
????????????????????Toast.makeText(MainActivity.this,"密碼錯(cuò)誤",Toast.LENGTH_SHORT);
????????????????}
????????????}
????????});
????}

????}